EH90 @ The Valve Museum

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EH90

Sensibly equivalent^¶ to:

6CS6

See also:

Valves and their Habits - Locked Oscillator Discriminator - New Mullard Television Valves - Valves for Dual Standard TVs Advert - EH90 Locked Oscillator and PL500 Advert - New TV Valves and Circuits

Extras ▼

Mullard G8LSD Valve Collection Other EH90 exhibits

The EH90 is an indirectly heated heptode mixer from the 1950's. In the early 1960's Mullard designed circuits for the EH90 so it could act as an FM demodulator for 6 MHz inter-carrier sound.

This exhibit from Mullard features the later yellow paint to mark the envelope. See Mullard for why the yellow paint was used.

See EH90 for full details.

The side view of the anode shows the wire grids.

The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 46 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type EH90 was first introduced in 1954. See also 1954 adverts.

Pin Connections

B7G	1	2	3	4	5	6	7
	g1	k,g5	h	h	a	g2,g4	g3

Absolute Maximum Operating Conditions^¶

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	100	30	-1	0.75	1.1	1M	0.95

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 03, 2019.

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